package taskrun

import (
	"context"
	"sync"
	"time"

	"chat-agent-system/internal/stream"
)

// CreateRequest 创建后台任务运行实例。
type CreateRequest struct {
	SessionID      string
	ProjectID      int64
	UserID         int64
	ClientTurnID   string
	TaskKey        string
	Stage          string
	WorkDir        string
	UserMessage    string
	AssistantMsgID int64
	IncludeDetails bool
	TaskReq        any // *server task payload converted to bizdev request at execution layer
}

// RunRecord 运行实例状态。
type RunRecord struct {
	RunID              string
	SessionID          string
	ProjectID          int64
	UserID             int64
	ClientTurnID       string
	IdempotencyKey     string // 新 run 稳定键；旧行保持 NULL 不参与唯一索引
	TaskKey            string
	Stage              string
	WorkflowInstanceID int64
	StageInstanceID    int64
	WorkflowStageKey   string
	Status             string // pending | running | completed | failed | cancelled | pending_author_confirmation | blocked_pending_governance | …
	WorkspaceID        string
	AssistantMsgID     int64
	WorkerID           string
	LeaseExpiresAt     *time.Time
	CreatedAt          time.Time
	UpdatedAt          time.Time
	ErrorMessage       string
	Attempt            int
}

// BuildTaskRunIdempotencyKey 新创建用稳定幂等键；空 client_turn 不设键。
func BuildTaskRunIdempotencyKey(sessionID, clientTurnID string) string {
	if sessionID == "" || clientTurnID == "" {
		return ""
	}
	return "turn:" + sessionID + ":" + clientTurnID
}

// StoredEvent 持久化 SSE 事件（支持重连重放）。
type StoredEvent struct {
	Seq   int64
	Event stream.StreamEvent
}

type activeRun struct {
	record  *RunRecord
	events  []StoredEvent
	nextSeq int64
	subs    map[int]chan StoredEvent
	subSeq  int
	cancel  context.CancelFunc
	done    chan struct{}
	mu      sync.RWMutex
}